Repair manual KTM LC4 Art.-Nr. 3.206.014 -E
11-7E
Engine 620 LC4 COMP.
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement 609 cm
3
Bore / Stroke 101 / 76 mm
Ratio 10,4 : 1
Fuel unleaded premium gasoline with a least RON 95
Valve timing 4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft 249° (249/1)
Valve timing by 1 mm IO 15° BTDC EO 52° BBDC
valve clearence IC 54° ABDC EC 17° ATDC
Valve diameter Intake: 36 mm Exhaust: 30 mm
Valve clearence cold Intake: 0,15 mm Exhaust: 0,15 mm
Crank shaft bearing 2 cylinder roller bearing
Connecting rod bearing needle bearing
Top end bearing bronze bushing
Piston forged/cast aluminium alloy
Piston rings 1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication forced-feed lubrication through Eaton-Oilpump with oil sump
Engine oil quantity 2,1 liters including frame
Primary ratio straight geared spur wheels 30 : 81 teeth
Clutch multi disc clutch in oil bath
Transmission 5-speed claw shifted
Gear ratio 1st 14:35
2nd 15:24
3rd 18:21
4th 20:19
5th 22:18
Ignition system contactless thyristor ignition with electronic advanced system type SEM
Ignition timing adjustment to max. 32 ° BTDC at 6000 rpm
Generator 12V 130W
Spark plug NGK DR8EA
Spark plug gap 0,7 mm
Cooling system liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
Cooling liquid 1 liter, 40% antifreeze, 60% water, at least –25 ° C (–13 ° F)
Starting equipment decompressor automatic and hand actuated, cold and hot start knob on carburetor
TECHNICAL SPECIFICATIONS – ENGINE 620 LC4 COMPETITION ‘98
BASIC CARBURETOR SETTING
Carburetor
Carburetor setting number
Main jet
Needle jet
Idling jet
Jet needle
Needle position from top
Mixture.adju. screw open
Throttle valve
Starting jet
Performance restrictor
PHM 40 SD
110996
155
DR 268
45
K 51
3 rd
1,5 turn
40
45
slide stop 26 mm
620 LC4 COMP.
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